中文摘要：

LDPC码具有编码增益高、译码速度快、可并行译码等特点，是当前编码界的一个研究热点。针对复杂多变、强多途和大起伏干扰的浅海水声信道，建立了LDPC码在浅海水声信道中仿真的模型，仿真研究了浅海水声信道下采用和一积译码算法的LDPC码性能。仿真结果表明，LDPC码在3径多途信道下性能优越；当译码迭代3—5次，码长1000bit左右时基本上能满足水声通信对误码率为10^-4的基本要求。

英文摘要：

In this paper, a channel model including time-varying fading, multipath and additive noise for the shallow water acoustic channels is proposed. Based on the channel model, the performances of the LDPC code with sum-product algorithm over shallow water acoustic channel is simulated. The simulation results show that the performance of LDPC code is excellent （Bit error rate less than 10^- 4） over three multipath shallow water acoustic channel, and with 3-5 iterative decoding times and about 1000bit code lengths, is suitable for shallow water acoustic communication.